package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车中的菜品
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //获得当前用户的id
        Long userId = BaseContext.getCurrentId();
        shoppingCart.setUserId(userId);
        //查询数据库是否存在相同菜品
      List<ShoppingCart> list = shoppingCartMapper.select(shoppingCart);

      //不存在
        if (list==null || list.size() ==0){
            //拿到菜品id
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = new Setmeal();
                setmeal.setId(setmealId);
                List<Setmeal> setmeals = setmealMapper.list(setmeal);
                Setmeal set = setmeals.get(0);

                shoppingCart.setName(set.getName());
                shoppingCart.setImage(set.getImage());
                shoppingCart.setAmount(set.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());

            shoppingCartMapper.insertShoppingCart(shoppingCart);
        }else {
             shoppingCart = list.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber()+1);
            shoppingCartMapper.upDateShoppingCart(shoppingCart);
        }


    }

    /**
     * 获取购物车中的全部信息
     * @return
     */
    @Override
    public List<ShoppingCart> attainShoppingCart() {
        Long userId = BaseContext.getCurrentId();
        List<ShoppingCart> list = shoppingCartMapper.attainShoppingCart(userId);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.clean(userId);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void sub(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);

        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> select = shoppingCartMapper.select(shoppingCart);
        if (select!=null && select.size()>0){
           shoppingCart = select.get(0);
            Integer number = shoppingCart.getNumber();

            if (number == 1){
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                shoppingCart.setNumber(shoppingCart.getNumber()-1);
                shoppingCartMapper.upDateShoppingCart(shoppingCart);
            }
        }
    }
}
